Decoding of the test message works down to ~10 dB SNR.
Still missing:
- Phase tracking during header and payload.
- CRC calculation and check.
- Data whitening.
The NCO frequency is now only adjusted every 8 symbols. That means that
the frequency error over the last 8 symbols before the adjustment is
(almost) constant, giving a good estimation result. Therefore, the
adjustment factor can be much larger than previously, leading to faster
acquisition time.
Thomas Kolb